Depending on the job; i find the deeper somebody knows his/her special field the better he/she can adapt to another field. I.e. if you really know the ins/outs

Depending on the job; i find the deeper somebody knows his/her special field the better he/she can adapt to another field. I.e. if you really know the ins/outs of the Java, the VM, changes of the language over time. You will be able to pick up C#, python f.e.